642964183 has 4 divisors (see below), whose sum is σ = 656644320. Its totient is φ = 629284048.

The previous prime is 642964159. The next prime is 642964193. The reversal of 642964183 is 381469246.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642964183 - 2²⁵ = 609409751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642964193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6839998 + ... + 6840091.

It is an arithmetic number, because the mean of its divisors is an integer number (164161080).

Almost surely, 2^642964183 is an apocalyptic number.

642964183 is a deficient number, since it is larger than the sum of its proper divisors (13680137).

642964183 is a wasteful number, since it uses less digits than its factorization.

642964183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13680136.

The product of its digits is 248832, while the sum is 43.

The square root of 642964183 is about 25356.7384140784. The cubic root of 642964183 is about 863.1022728384.

The spelling of 642964183 in words is "six hundred forty-two million, nine hundred sixty-four thousand, one hundred eighty-three".